If these games go really slow, then some of these might be good at breaking those stalled boards, especially this Crystal
If you want to know how much it costs to grade cards, or if it is worthwhile investment, all your answers about Pokemon slabs can be found here
Get Clobberin' We've arrived at the moment of truth
Note that I dont actually have a perfect answer: this is, according to Limitless data, an unfavorable matchup, although several Rapid Strike players have told me it was not that easy for them
What takes it up another level is the fact that later instances of Voidwalker can cast any card with a void counter on it, which makes it brilliant in any deck that can grant it haste and keep bringing it back
Get twice the triggers and returning twice the enchantments